CloudStack HostTags API Missing Auth (4.124.20.3.0, 4.214.22.1.0)
CVE-2026-66721 Published on August 21, 2026
Apache CloudStack: Authorization issue with listHostTags for domain admins
Missing authorization issue for domain admins in CloudStack's host tags listing functionality.
Domain Admins, by default, have permission to call the listHostTags API, but the API returns host tags for every host in the environment without domain scoping. It should instead be restricted to only the hosts dedicated to that admin's domain.
This issue affects Apache CloudStack: from 4.12.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.
Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.
Vulnerability Analysis
CVE-2026-66721 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-66721 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-66721
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Affected Versions
Apache Software Foundation Apache CloudStack:- Version 4.12.0.0, <= 4.20.3.0 is affected.
- Version 4.21.0.0, <= 4.22.1.0 is affected.